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Registered
Join Date: Jun 2015
Location: San Diego CA
Posts: 117
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78 SC A/C Electrical Help Needed
Bought a solid very original '78 SC with the exception of the motor needing rebuild, which I was able to do myself, and the A/C not working.
A new compressor was installed but not plumbed or wired. Decided to got the Griffiths route with a complete system so my wife would ride with me. After a few days had the old out /new in, then took it to get evacuated and charged. Holding a charge the A/C would NOT run on its own, but WOULD run when the A/C guy applied power direct to the compressor. Troubleshooting revealed the thermostat (left dial) and fan switch (rt. dial) both working properly with power going into and out of each. The problem is with the original green wire from the thermostat to the compressor has no current or continuity. Wiring diagram says direct shot between the two? Not sure the diagram is correct on that straight shot. Electrical in not my strong suit. Do not know actual wiring path through the car to trace for problems. A friend suggested run new wire but would rather like to resolve original set up. Suggestions/ approaches appreciated. Thanks |
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11-22-2019, 09:03 AM
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ROW '78 911 Targa
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The green wire is a direct run from the compressor through the tunnel to a single plug in the trunk or maybe at the controls.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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11-22-2019, 09:52 AM
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Registered
Join Date: Jun 2015
Location: San Diego CA
Posts: 117
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Quote:
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11-22-2019, 12:02 PM
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Been here a while
Join Date: Apr 2004
Location: East coast, west coast, typ. 35,000 ft
Posts: 2,437
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Check the relay in the smugglers box.
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looking for 1972 911t motor XR584, S/N 6121622 |
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11-22-2019, 01:15 PM
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Porsche Addict
Join Date: May 2014
Location: San Clemente, Ca
Posts: 1,141
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I have no air conditioning so my wife WON'T ride with me.
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Lawrence - 1986 911 Carrera Coupe Grand Prix White 1959 Land Rover Series II 1962 Volkswagen Sedan Ragtop 1959 Porsche 356A Coupe 1971 Porsche 911T coupe |
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12-11-2019, 02:44 PM
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Get off my lawn!
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Working AC is a wonderful thing and allows me to drive all through the hottest part of summer in comfort.
For any question on the AC, your best bet is contact Charlie directly. He will reply be email, or call you back on the phone. His email will include exact procedures for what to do. He has the type of tech support other companies should replicate.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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12-12-2019, 05:36 AM
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Wildman Emeritus
Join Date: Feb 2003
Location: Chitown Burbs
Posts: 1,875
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Check the smugglers box relay and its fuse. I had similar problems and the fuse had died. Scratched my head until somebody suggested this possibility. Replaced the fuse and, bingo, AC. Blew again and I traced the problem to a bad front condenser motor.
My wife won't ride with me anyway unless forced so the AC is for me.
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Mike Andrew 1980 SCWDP 2024 Suby Forester 2018 BMW X1- Wife's 2000 Boxter - Sold |
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12-14-2019, 05:32 AM
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Heinz
Carrera
